DE3681445D1 - METHOD AND DEVICE FOR MEASURING LIQUID FLOW. - Google Patents

METHOD AND DEVICE FOR MEASURING LIQUID FLOW.

Info

Publication number
DE3681445D1
DE3681445D1 DE8686105379T DE3681445T DE3681445D1 DE 3681445 D1 DE3681445 D1 DE 3681445D1 DE 8686105379 T DE8686105379 T DE 8686105379T DE 3681445 T DE3681445 T DE 3681445T DE 3681445 D1 DE3681445 D1 DE 3681445D1
Authority
DE
Germany
Prior art keywords
conduit
sensitive element
thermally sensitive
fluid
temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
DE8686105379T
Other languages
German (de)
Inventor
Donald F Wiseman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of DE3681445D1 publication Critical patent/DE3681445D1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
    • G01F1/696—Circuits therefor, e.g. constant-current flow meters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
    • G01F1/684—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow

Abstract

The apparatus comprises a thermally sensitive element capable of producing a measurement value related to temperature located within the conduit. The element is exposed to the flow of fluid through the conduit. A second thermally sensitive element is capable of producing a reference value related to temperature of fluid ambient to the conduit. The reference value is unaffected by heat generated by the second thermally sensitive element. An electrical circuit determines the measurement and reference values and uses them to produce an indication which eliminates errors due to changes in the ambient temperature and caused by velocity cooling of the first thermally sensitive element. The indication is representative of fluid flow through the conduit.
DE8686105379T 1986-04-18 1986-04-18 METHOD AND DEVICE FOR MEASURING LIQUID FLOW. Expired - Lifetime DE3681445D1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP86105379A EP0242412B1 (en) 1986-04-18 1986-04-18 Method and apparatus for measuring fluid flow

Publications (1)

Publication Number Publication Date
DE3681445D1 true DE3681445D1 (en) 1991-10-17

Family

ID=8195071

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8686105379T Expired - Lifetime DE3681445D1 (en) 1986-04-18 1986-04-18 METHOD AND DEVICE FOR MEASURING LIQUID FLOW.

Country Status (3)

Country Link
US (1) US4599895A (en)
EP (1) EP0242412B1 (en)
DE (1) DE3681445D1 (en)

Families Citing this family (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4599895A (en) * 1984-07-12 1986-07-15 Wiseman Donald F Method and apparatus for measuring fluid flow
US4730623A (en) * 1985-06-14 1988-03-15 Lee Arnold St J Cardiac output estimation method and apparatus
US4779458A (en) * 1986-12-29 1988-10-25 Mawardi Osman K Flow sensor
US4770035A (en) * 1987-01-15 1988-09-13 Tek-Air Systems, Inc. Airflow measurement utilizing vortex shedding
US4942763A (en) * 1988-03-23 1990-07-24 Harpster Joseph W Flow sensor assembly
US4961348A (en) * 1988-12-16 1990-10-09 Ulrich Bonne Flowmeter fluid composition correction
US4982605A (en) * 1989-05-17 1991-01-08 Alnor Instrument Company Air flow monitor and temperature compensating circuit therefor
AU7252191A (en) * 1990-02-12 1991-09-03 Ebtron, Inc. Air flow sensor
JP2538852B2 (en) * 1991-03-20 1996-10-02 三菱電機株式会社 Thermal flow sensor
US5419190A (en) * 1992-08-03 1995-05-30 Thermal Instrument Co. Apparatus and method for measurement of mass flow rates in a large conduit
JPH07190821A (en) * 1993-12-24 1995-07-28 Nippondenso Co Ltd Flowmeter
EP0763718A4 (en) * 1994-06-03 1997-11-05 Tokyo Gas Co Ltd Flowmeter
US5460039A (en) * 1994-07-12 1995-10-24 Bear Medical Systems, Inc. Flow sensor system
EP1041367A4 (en) * 1997-12-15 2005-08-17 Tokyo Gas Co Ltd Flowmeter
US20050121033A1 (en) * 1998-02-25 2005-06-09 Ric Investments, Llc. Respiratory monitoring during gas delivery
US6017315A (en) 1998-02-25 2000-01-25 Respironics, Inc. Patient monitor and method of using same
US6544192B2 (en) 1998-02-25 2003-04-08 Respironics, Inc. Patient monitor and method of using same
US6450024B1 (en) 2001-03-07 2002-09-17 Delta M Corporation Flow sensing device
KR20030071115A (en) * 2002-02-27 2003-09-03 덕산공조기계주식회사 airflow measurement apparatus
US6915705B1 (en) 2002-04-03 2005-07-12 Ric Investments, Inc. Flow sensor and flow resistive element
US6874362B2 (en) * 2003-05-14 2005-04-05 Visteon Global Technologies, Inc. Mass air flow sensor with stress free sensor element mounting
TWI220540B (en) * 2003-07-18 2004-08-21 Au Optronics Corp Buffer of pressure gauge sensor used in dry etching reaction chamber
GB2480881B (en) * 2010-06-04 2012-10-24 Servomex Group Ltd Thermal fluid flow apparatus
GB2577634B (en) 2012-04-27 2020-09-30 Fisher & Paykel Healthcare Ltd Respiratory humidification apparatus
CN105764560B (en) 2013-09-13 2018-04-06 费雪派克医疗保健有限公司 Connection for humidification system
US10449319B2 (en) 2014-02-07 2019-10-22 Fisher & Paykel Healthcare Limited Respiratory humidification system
US11324911B2 (en) 2014-06-03 2022-05-10 Fisher & Paykel Healthcare Limited Flow mixers for respiratory therapy systems
GB2553681B (en) 2015-01-07 2019-06-26 Homeserve Plc Flow detection device
GB201501935D0 (en) 2015-02-05 2015-03-25 Tooms Moore Consulting Ltd And Trow Consulting Ltd Water flow analysis
USD800591S1 (en) 2016-03-31 2017-10-24 Homeserve Plc Flowmeter
WO2018106126A1 (en) 2016-12-07 2018-06-14 Fisher And Paykel Healthcare Limited Sensing arrangements for medical devices
DE102019103674A1 (en) * 2019-02-13 2020-08-13 Helmholtz-Zentrum Dresden-Rossendorf E. V. Flow measurement arrangement and fluidic arrangement

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Publication number Priority date Publication date Assignee Title
US2831351A (en) * 1948-07-29 1958-04-22 Mine Safety Appliances Co Electrical system for measuring the rate of motion of a fluid
US2859617A (en) * 1954-10-22 1958-11-11 Northrop Aircraft Inc Thermal flowmeter
US3800592A (en) * 1972-01-13 1974-04-02 Westerbeke J Corp Flowmeter
US3891391A (en) * 1973-05-14 1975-06-24 George R Boone Fluid flow measuring system using improved temperature compensation apparatus and method
DE2420032A1 (en) * 1974-04-25 1975-11-13 Bosch Gmbh Robert FUEL INJECTION SYSTEM
NO147929C (en) * 1976-12-20 1983-07-06 Bronson M Potter OIL POLLUTION DETECTION SYSTEM.
DE2750050C2 (en) * 1977-11-09 1983-12-08 Robert Bosch Gmbh, 7000 Stuttgart Device for air volume measurement
DE2751196C2 (en) * 1977-11-16 1985-06-20 Robert Bosch Gmbh, 7000 Stuttgart Device for air volume measurement
DE2934137C2 (en) * 1978-08-25 1985-05-15 Nissan Motor Co., Ltd., Yokohama, Kanagawa Flow measuring arrangement for measuring an amount of flow in a tubular channel
DE3103051C2 (en) * 1981-01-30 1985-08-01 Paul Walter Prof. Dr. Baier Device for measuring the flow rate of a flowing fluid
US4413514A (en) * 1981-05-22 1983-11-08 Hoffman Controls Corporation Air flow sensor
US4494406A (en) * 1982-12-23 1985-01-22 Ebtron, Inc. Means for measuring large area mass flow
US4599895A (en) * 1984-07-12 1986-07-15 Wiseman Donald F Method and apparatus for measuring fluid flow

Also Published As

Publication number Publication date
EP0242412B1 (en) 1991-09-11
US4599895A (en) 1986-07-15
EP0242412A1 (en) 1987-10-28

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee